fix: add mock for staging buffer size

No need to allocate 2MB in unit tests.
This commit changes this size to 4KB.

Signed-off-by: Szymon Morek <szymon.morek@intel.com>

shared/source/dll/CMakeLists.txt

@@ -18,6 +18,7 @@ set(NEO_SHARED_DLLS
     ${CMAKE_CURRENT_SOURCE_DIR}/unified_memory_reuse_cleaner_enabled.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/create_command_stream.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/options_dll.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/get_staging_buffer_size.cpp
 )
 
 add_library(neo_shared_dlls_precompiled_objects OBJECT ${NEO_SHARED_DLLS})

shared/source/dll/get_staging_buffer_size.cpp

@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2025 Intel Corporation
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+#include "shared/source/utilities/staging_buffer_manager.h"
+
+namespace NEO {
+size_t getDefaultStagingBufferSize() {
+    return MemoryConstants::pageSize2M;
+}
+
+} // namespace NEO